| Author |
Message |
    
Crackshot
Intermediate Member
Username: Crackshot
Post Number: 171
Registered: 10-2005
| | Posted on Monday, April 24, 2006 - 9:34 am: | 
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Ok I had a major problem with mounting A-99 above M-103. Wind! We had 50 mph gusts and was really unsafe on my pushup mast even with a lot of guy wires securing it down. It was too top heavy so down it came, removed the A-99 and up went the Maco M-103 again. It made a big difference and could handle the wind loads no problem.
I have an area where I can mount the A-99 on side of my house on a 10 foot mast about 10 feet away from the turning radius of the M-103.
I am using a good 1000 watt switch box.
Will this be ok without causing coupling of affecting patterns? |
Marconi
Advanced Member
Username: Marconi
Post Number: 647
Registered: 11-2001
| | Posted on Monday, April 24, 2006 - 10:52 am: |
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Crackshot, there is probably enough seperation in polarities between the two that both will work fine. Problem is that the both will likely be affected a bit by the presence of the other, but it might be really hard to tell. Try it and see how it goes unless you have a better alternative that will get them about 20' or farther apart. |
Tech237
Moderator
Username: Tech237
Post Number: 298
Registered: 4-2004
| | Posted on Monday, April 24, 2006 - 12:23 pm: |
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It should be OK, although, personally I'd try for further separation just to be safe. Does that switchbox ground the unused antenna?? I ask as I have known a few times were the unused antenna has created interference type problems. Grounding it during non use seemd to solve the issues. |
Crackshot
Intermediate Member
Username: Crackshot
Post Number: 172
Registered: 10-2005
| | Posted on Monday, April 24, 2006 - 1:29 pm: |
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The switchbox is a PDC4-DX. I do not know if it grounds out other antennas not being used.
I do have box grounded though and all other equipment. |
Crackshot
Intermediate Member
Username: Crackshot
Post Number: 175
Registered: 10-2005
| | Posted on Wednesday, April 26, 2006 - 11:54 am: |
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Ok mounted the A-99 about 10 feet away from maco beam, 11 foot mast attached to side of house. Got a 1.5:1 SWR all the way across band.
Seems to work great for local and seems not affecting beam. SWR on both antennas are pretty good. Now all I need is some skip!
Thanks for all the help. |
Marconi
Advanced Member
Username: Marconi
Post Number: 651
Registered: 11-2001
| | Posted on Wednesday, April 26, 2006 - 2:55 pm: |
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Well you might have a wait on skip being a regular thing everyday again. Seems we are just now coming out of the low point in the 11 Year Skip Cycle. |
Tech237
Moderator
Username: Tech237
Post Number: 303
Registered: 4-2004
| | Posted on Wednesday, April 26, 2006 - 3:32 pm: |
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Ok. NO wories, but if, in the future you get any comments on interference, try making sure the un-used antenna is grounded and see ifnthat fixes the problem. |
Georgeodjungle
Member
Username: Georgeodjungle
Post Number: 73
Registered: 1-2006
| | Posted on Thursday, April 27, 2006 - 1:42 am: |
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any way to mount an omnie on the same mount or tower as a beam?
like a duhster or 2000 on the boom of a mr4.
could go 8' or so higher than the top of the beam.
1"1/4 sch 80.
just worried about the grounded part of the mast of the omnie ant through the beam.
ya know just behind the driver & way in front of the float or "reflector"
would the mast of the omnie wack out the beam?
the mast, on the beam covers 1/2 ant ways.
even with the gamma upside down, doesn't seem to make a diff.
wider or narrow lobe would be o.k.
what would it do.
i've have had some tell me but,
no ones ever tried it.
see,
if i take down my omnie, the yl said "i could put up another wind gennie."
so can they be stacked?
she is... |
Tech237
Moderator
Username: Tech237
Post Number: 304
Registered: 4-2004
| | Posted on Thursday, April 27, 2006 - 8:57 am: |
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Sure you can stack tehm. Just put the vertical at least 1/4 wave above the yagi. Take alook at most ham towers and you will beams stakced for several bands and then a vertical above them. |
Wayne
Member
Username: Wayne
Post Number: 61
Registered: 12-2001
| | Posted on Saturday, April 29, 2006 - 6:23 pm: |
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Hello Marconi I listen to you talk about antennas and you shure do know about them. I have a wilson 12 element lazer but just run the flat side, I was thinking about going to a 10T gamma from a 2T, but someone told me I could use a hot feed what are your ideas about that?
Thanks Wayne |
Allan
Member
Username: Allan
Post Number: 92
Registered: 2-2006
| | Posted on Saturday, April 29, 2006 - 9:29 pm: |
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Back in the day ('80's), I had a 3 element yagi (very similar to the M-103) turned flatside with a 1/2 wave dipole (Shakespeare Bigstick) mounted on top. Worked beautifully with very low SWR's.... |
Marconi
Advanced Member
Username: Marconi
Post Number: 652
Registered: 11-2001
| | Posted on Sunday, April 30, 2006 - 4:47 am: |
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Wayne get this somebody you reference to fully explain what he is talking about and then ask your questions again if you still have any.
I do not know these generic terms you are using. |
Wayne
Member
Username: Wayne
Post Number: 62
Registered: 12-2001
| | Posted on Monday, May 01, 2006 - 1:19 am: |
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Marconi using the hot feed means using the driven element as my gama, The highgain long john didn't have a gamma match it used a beta match. Hope this was a little better. |
